package b4;

public class StudentTest2 {
    public static void main(String[] args) {
        Object s = new Student("20240101", "张三", 19);
        Object ss = new SStudent("20240102", "李四", 21);
        System.out.println("Student:  " + s);
        System.out.println("SStudent: " + ss);
    }
}
